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Analog Electronics
Diode Circuits and ApplicationsFrequency ResponseBjt and Mosfet Biasing555 TimerFeedback Amplifiers and Oscillator CircuitsOperational AmplifierSmall Signal Modeling
Small Signal Modeling
Practice Questions
Marks 1
1

For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is

GATE EE 2022
2
In the single stage transistor amplifier circuit shown in figure, the capacitor $${C_E}$$ is removed. Then the ac small signal midband voltage gain of the amplifier GATE EE 2001 Analog Electronics - Small Signal Modeling Question 10 English
GATE EE 2001
3
In the transistor amplifier shown in figure, the ratio of small signal voltage gain when the emitter resistor is bypassed by the capacitor $$'{C_e}'$$ to when it is not bypassed. (Assuming of simplified approximate $$h$$- parameter model for transistor) is GATE EE 1996 Analog Electronics - Small Signal Modeling Question 5 English
GATE EE 1996
Marks 2
1
In the circuit, $I_{\mathrm{DC}}$ is an ideal current source. The transistors $M_1$ and $M_2$ are assumed to be biased in saturation, wherein $V_{\text {in }}$ is the input signal and $V_{D C}$ is fixed DC voltage. Both transistors have a small signal resistance of $r_{d s}$ and trans-conductance of $g_m$. The small signal output impedance of this circuit is GATE EE 2025 Analog Electronics - Small Signal Modeling Question 1 English
GATE EE 2025
2
The transconductance $${g_m}$$ of the transistor shown in figure is $$10$$ $$mS.$$ The value of input resistance $${R_{in}}$$ is GATE EE 2004 Analog Electronics - Small Signal Modeling Question 9 English
GATE EE 2004
Marks 5
1
The transistor in the amplifier circuit shown in the figure is biased at $${{\rm I}_C} = mA.$$ Use $${V_T}\left( { = {{kT} \over q}} \right) = 26\,mV,$$ $${\beta _0} = 2000,\,{r_b} = 0$$ and $${r_0} \Rightarrow \infty $$ GATE EE 2001 Analog Electronics - Small Signal Modeling Question 6 English
$$(a)$$ Determine the AC small signal midband voltage gain $$\left( {{\raise0.5ex\hbox{$\scriptstyle {{V_o}}$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle {{V_i}}$}}} \right)$$ of the circuit
$$(b)$$ Determine the required value of $${C_E}$$ for the circuit to have a lower cutoff frequency of $$10Hz$$
GATE EE 2001
2
A current amplifier has an input resistance of $$10\Omega ,$$ an output resistance of $$10\,\,k\Omega $$ and a Current gain of $$1000.$$ It is feed by a current source having a source resistance of $$10$$ $$k\Omega $$ and its output connected to a $$10\,\,k\Omega $$ load resistance. Find the voltage gain and the power gain
GATE EE 2000
3
For the small signal $$BJT$$ amplifier shown in given figure. Determine at $$1$$ $$kHz$$ the following GATE EE 1999 Analog Electronics - Small Signal Modeling Question 8 English

$$(a)$$ $$\,\,\,\,\,\,\,\,$$ Quiescent collector current $${{\rm I}_{CQ}}$$
$$(b)$$ $$\,\,\,\,\,\,\,\,$$ Small signal voltage gain $${{{V_o}} \over {{V_i}}}$$
$$(c)$$ $$\,\,\,\,\,\,\,\,$$ Max. possible swing of the collector current.

GATE EE 1999
4
For the $$JFET$$ amplifier shown in figure $$\mu = 100,\,{r_d} = 50k\Omega $$
$$(i)$$ Draw the $$AC$$ equivalent circuit
$$(ii)$$ Find the voltage gain of the amp GATE EE 1992 Analog Electronics - Small Signal Modeling Question 3 English
GATE EE 1992
5
Figure shows a common emitter amplifier GATE EE 1991 Analog Electronics - Small Signal Modeling Question 4 English 1 GATE EE 1991 Analog Electronics - Small Signal Modeling Question 4 English 2

$$(a)$$ Simplify the circuit by applying thevenin's theorem to biasing network $${R_1},{R_2}$$ at
$$\,\,\,\,\,\,\,$$ the base of the transistor.
$$(b)$$ Assuming $${C_s}$$ to be a short for frequency range considered. Draw the small signal
$$\,\,\,\,\,\,\,$$ $$a.c.$$ model of the circuit obtained in $$(a)$$ by using the simple model for the
$$\,\,\,\,\,\,\,$$ transistor shown in figure.
$$(c)$$ Evaluate the small signal gain $$\left( {{{{V_0}} \over {{V_i}}}} \right)$$ of the amplifier.

GATE EE 1991